使用加法交换律和结合律可以简便计算。
3.25-(2.28+1.75)-2.78
=3.25-1.75-2.28-2.78
=1.5-(2.28+2.72+0.06)
=1.5-5-0.06
=-3.5-0.06
=-3.56
简便运算
3.25-(2.28+1.75)-2.78
=3.25-2.28-1.75-2.78
=3.25-1.75-(2.28+2.78)
=1.5-5.06
=-3.56
3.25-(2.28+1.75)-2.78
=-3.56
3.25-(2.28+1.75)-2.78
=3.25-1.25-0.5-2.22-0.06-2.78
=(3.25-1.25)-(2.22+2.78)-(0.5+0.06)
=2-5-0.56
=-3.56
3.25-(2.28+1.75)-2.78
=3.25-2.28-1.75-2.78
=(3.25-1.75)-(2.28+2.78)
=1.5+5.06
=6.56